| /* |
| * |
| * Copyright (c) International Business Machines Corp., 2001 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* |
| * NAME |
| * times03.c |
| * |
| * DESCRIPTION |
| * Testcase to check the basic functionality of the times() system call. |
| * |
| * ALGORITHM |
| * This testcase checks the values that times(2) system call returns. |
| * Start a process, and spend some CPU time by performing a spin in |
| * a for-loop. Then use the times() system call, to determine the |
| * cpu time/sleep time, and other statistics. |
| * |
| * USAGE: <for command-line> |
| * times03 [-c n] [-f] [-P x] [-t] |
| * where, -c n : Run n copies concurrently. |
| * -f : Turn off functionality Testing. |
| * -P x : Pause for x seconds between iterations. |
| * -t : Turn on syscall timing. |
| * |
| * History |
| * 07/2001 John George |
| * -Ported |
| * |
| * Restrictions |
| * NONE |
| */ |
| |
| #include <sys/types.h> |
| #include <sys/times.h> |
| #include <errno.h> |
| #include <wait.h> |
| #include <time.h> |
| #include "test.h" |
| #include <signal.h> |
| #include <stdint.h> |
| |
| char *TCID = "times03"; |
| int TST_TOTAL = 1; |
| |
| volatile int timeout; /* Did we timeout in alarm() ? */ |
| |
| void work(void); |
| void sighandler(int signal, siginfo_t * info, void *uc); |
| |
| void setup(void); |
| void cleanup(void); |
| |
| int main(int argc, char **argv) |
| { |
| const char *msg; |
| |
| struct tms buf1, buf2; |
| time_t start_time, end_time; |
| int pid2, status; |
| struct sigaction sa; |
| |
| if ((msg = parse_opts(argc, argv, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| |
| /* |
| * We spend time in userspace using the following mechanism : |
| * Setup an alarm() for 3 secs and do some simple loop operations |
| * until we get the signal. This makes the test independent of |
| * processor speed. |
| */ |
| sa.sa_sigaction = sighandler; |
| sigemptyset(&sa.sa_mask); |
| sa.sa_flags = SA_SIGINFO; |
| |
| if (sigaction(SIGALRM, &sa, NULL) < 0) |
| tst_brkm(TBROK | TERRNO, cleanup, "Sigaction failed !\n"); |
| |
| timeout = 0; |
| alarm(3); |
| |
| work(); |
| |
| /* |
| * At least some CPU time must be used in system space. This is |
| * achieved by executing the times(2) call for |
| * atleast 5 secs. This logic makes it independant |
| * of the processor speed. |
| */ |
| start_time = time(NULL); |
| for (;;) { |
| if (times(&buf1) == -1) |
| tst_resm(TFAIL | TERRNO, "times failed"); |
| end_time = time(NULL); |
| if ((end_time - start_time) > 5) { |
| break; |
| } |
| } |
| if (times(&buf1) == -1) { |
| tst_resm(TFAIL | TERRNO, "times failed"); |
| } else { |
| if (buf1.tms_utime == 0) |
| tst_resm(TFAIL, "times report " "0 user time"); |
| if (buf1.tms_stime == 0) |
| tst_resm(TFAIL, "times report " |
| "0 system time"); |
| if (buf1.tms_cutime != 0) |
| tst_resm(TFAIL, "times report " |
| "%ld child user time", |
| buf1.tms_cutime); |
| if (buf1.tms_cstime != 0) |
| tst_resm(TFAIL, |
| "times report " |
| "%ld child system time", |
| buf1.tms_cstime); |
| |
| pid2 = FORK_OR_VFORK(); |
| if (pid2 < 0) { |
| tst_brkm(TFAIL, cleanup, "Fork failed"); |
| } else if (pid2 == 0) { |
| |
| /* Spend some cycles in userspace */ |
| |
| timeout = 0; |
| alarm(3); |
| |
| work(); |
| |
| /* |
| * Atleast some CPU system ime must be used |
| * even in the child process (thereby |
| * making it independent of the |
| * processor speed). In fact the child |
| * uses twice as much CPU time. |
| */ |
| start_time = time(NULL); |
| for (;;) { |
| if (times(&buf2) == -1) { |
| tst_resm(TFAIL, |
| "Call to times " |
| "failed, " |
| "errno = %d", errno); |
| exit(1); |
| } |
| end_time = time(NULL); |
| if ((end_time - start_time) |
| > 10) { |
| break; |
| } |
| } |
| exit(0); |
| } |
| |
| waitpid(pid2, &status, 0); |
| if (WEXITSTATUS(status) != 0) { |
| tst_resm(TFAIL, "Call to times(2) " |
| "failed in child"); |
| } |
| if (times(&buf2) == -1) { |
| tst_resm(TFAIL | TTERRNO, "times failed"); |
| } |
| if (buf1.tms_utime > buf2.tms_utime) |
| tst_resm(TFAIL, "Error: parents's " |
| "user time(%ld) before child " |
| "> parent's user time (%ld) " |
| "after child", |
| buf1.tms_utime, buf2.tms_utime); |
| if (buf2.tms_cutime == 0) |
| tst_resm(TFAIL, "times " |
| "report %ld child user " |
| "time should be > than " |
| "zero", buf2.tms_cutime); |
| if (buf2.tms_cstime == 0) |
| tst_resm(TFAIL, "times " |
| "report %ld child system time " |
| "should be > than zero", |
| buf2.tms_cstime); |
| } |
| |
| cleanup(); |
| tst_exit(); |
| } |
| |
| /* |
| * sighandler |
| * Set the timeout to indicate we timed out in the alarm(). |
| */ |
| |
| void sighandler(int signal, siginfo_t * info, void *uc) |
| { |
| if (signal == SIGALRM) |
| timeout = 1; |
| else |
| tst_brkm(TBROK, cleanup, "Unexpected signal %d\n", signal); |
| } |
| |
| /* |
| * work |
| * Do some work in user space, until we get a timeout. |
| */ |
| |
| void work(void) |
| { |
| int i, j, k; |
| |
| while (!timeout) |
| for (i = 0; i < 10000; i++) |
| for (j = 0; j < 100; j++) |
| k = i * j; |
| timeout = 0; |
| } |
| |
| /* |
| * setup() |
| * performs all ONE TIME setup for this test |
| */ |
| void setup(void) |
| { |
| |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| |
| /* Pause if that option was specified |
| * TEST_PAUSE contains the code to fork the test with the -c option. |
| */ |
| TEST_PAUSE; |
| } |
| |
| /* |
| * cleanup() |
| * performs all ONE TIME cleanup for this test at |
| * completion or premature exit |
| */ |
| void cleanup(void) |
| { |
| |
| } |